UK based Cinematographer Richard William Preisner, in collaboration with ROSCO, has created what he terms the Diffusion Comparison Tool designed to make comparing different diffusion materials quick and easy.  He has photographically catalogued many different types of Rosco diffusion and textiles in a simple and straight forward way to allow lighting professionals, filmmakers and creatives to access the comparisons easily in prep or on the set.  Freely available on his website with shortcuts for iOS and Android devices, it features 20+ different diffusion and bounce materials that can be compared to help decide which diffusion material is right for your creative project.  Preisner describes the tool in this short trailer:  https://vimeo.com/728120620/b66215c9f2

Or go directly to his website to start using this handy tool:  https://www.rwpreisner.com/diffusion